linux-kernel - [PATCH] KVM: VMX: dump VMCS on failed entry

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Message-Id: <1563554534-46556-1-git-send-email-pbonzini@redhat.com>
Date:   Fri, 19 Jul 2019 18:42:12 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH] KVM: VMX: dump VMCS on failed entry

This is useful for debugging, and is ratelimited nowadays.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/vmx/vmx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 69536553446d..c7ee5ead1565 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -5829,6 +5829,7 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu)
 	}
 
 	if (unlikely(vmx->fail)) {
+		dump_vmcs();
 		vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY;
 		vcpu->run->fail_entry.hardware_entry_failure_reason
 			= vmcs_read32(VM_INSTRUCTION_ERROR);
-- 
1.8.3.1